Well, trying my best in changing parts, and attacked my exhuast.

Right now, I finally changed out my beat up rattling stock exhaust and replaced the whole Cat back to 2.25 stainless steel piping, with straight through exhuast.

Thing is, the car still has stock Headers and Cat, sounds funny as if lots of vibration is running through the system, I would imagine.

Out of experience, has anyone ever ran like this for a while and also lost power??

Do plan (looking for) on getting a real cat..maybe Carsound..and a simple 4-2-1 header as my car is pretty dang low for a 4-1

Motor is an LS btw.

Thanks